Eraser structure.



J. AULD. ERASER STRUCTURE.

APPLICATION FILED FEB. 6 1919.

Patented Apr'. 1,1919.

i '.ENTTED J AU'LD, OF CHICAGG, ILLINOIS.

ERASER STRUCTURE.

To all 'whom t may concern:

Be it known that I, JOHN AULD, a citizen of the United States, and aresident of Chicago', in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Eraser Structures, ofwhich the following is a specication.

My invention relates to eraser structures, and particularly to improvedholders and brush attachments therefor.

Although my invention may be employed in connection with different typesof erasers, it is particularly desirable in connection with the circulardisk type of eraser.

The object of the invention is to provide a sheet metal supporting framefor the eraser, together with a handle or holder hinged to the fra-me,for affording better hold for guiding and steadying the eraser and forpermitting more accurate use thereof. The handle or -holder structuremay have a brush secured thereto, and another feature of the invention-involves the irnprovement of forming the brush.

The various features of the invention are shown in the -accompanyingdrawings, in which* Figure 1 is a side elevational view of the eraserstructure, involving an eraser disk, supporting frame and handle.

Fig. 2 is an edge view of the structure of Fig. 1.

Fig. 3 is a side elevational View showing a brush secured to the holder.

Fig. 4 shows a modified form of supporting frame.

Fig. 5 is a sectional View on line 5 5 of Fig. 4.

Figs. 6, 7 and 8 show various steps in the formation of the brush andholder, and

Fig. 9 is a plan view of another form of the eraser structure to whichmy invention is applied.

Referring to Figs. v1 and 2, the eraser structure comprises the circularrubber disk 10, the supporting frame 11 and the wire holder 12. Thesupporting frame is of sheet metal and is of U-shape. The limbs of theframe have at their ends openings for registering with the centeropening usually found inl circular eraser disks, a tubular rivet 13extending through the openings to secure the eraser disk to the framefor rotation therein so that different surfaces of the Specification ofLetters Patent.

Patented Apr. 1, i1919.

Appueatien sied February e, 191s. serial No. 275,478. y

eraser may lbe presented for use. The holder 12 is of U-shape and isbent from a piece of wire, its ends 14 and 15 being deflected inwardlyinto coin-cident lines to form pivot trunnions. The frame 11 at itsVbend iS formed to provide the opposite pivot openings 16 and 17 for thetrunnion ends 14 and 15. The wire holder is normally sprung so that whenit is applied to the supporting frame its sideswill be spread apart toafford spring pressure against the supporting ',frame. It is verydesirable that when the eraser 'is not in use the holder should assume aneutral position to lie in the plane of the eraser disk, but to yield t0swinging movement so that the structure can be readily grasped and itsparts swung relatively during use.

'In Figs. 1 and 2 this is accomplished by I diagonal cutting away of thecorners at the bend of the supporting frame 11, thus leaving diagonalcam surfaces which cause spreading apart of the holder sides when it isswung, the tendency being then to keep Vthe holder extending away fromthe frame and in the plane thereof.

, In Fig. 3 the holder 12 is shown supporting the brush cup 18 fromwhich the bristles 19 extend andadditional means in the form of a thinflat spring 20 is provided for keeping the holder yieldingly in neutralposition. This spring is shown secured to the cup18 at its upper end,extends at its lower end between the sides of the frame 11 through thenotch 21 formed in the bend of the frame. When the brush is to be usedfor cleaning purposes the eraser structure may be held by the frame 11.The flexible yielding or spring hinge connection of the brush holder andthe frame permits a more yielding and softer application of the brush totypewritten documents.

'In the arrangement of Figs. 4 and 5 the eraser disk 10 is reinforced bythe side plates 22 and 23, secured together by the tubular rivet 24 andthe frame 11 has detachable connection with the eraser, and at the endsof its limbs has the beads or projections 25- spreading apart of theframe when the f of bristles .at the holder 12 is swung, and only thespring 20 is relied upon forlkeeping the holderv nor- Inally in itsneutraliposition. Y

In Figs. 6, 7 and 8 the manner of forming the holder andformingandhsecuringr the A lengthof. vwires brush thereto is shown.first bent into the form of a hairpin, andits bent end is slippedthrough the opening 27" Y in thefbasef ofthe cup 18.- A bundle`ofbristles 29 is then inserted .throughtheA bend of d thewire and theWire then pulled doWnw wardly into .the cupgthus bending the bundlemiddle'andbringing the l two ends thereof/together to form the brush.k.The cupk is then `flattened to secure the bristlestherein and theendsof the wireare then bent to formshoulders 30y and 31 forengag-,ingiwitlr the cup to prevent displacement thereof.Y The wire is thenfurther benty to formits.parallel sides andthe trunnion ,-,end'sllandf15; Y v d `gFig,.5 shows more clearlythe manner, of I v"securingthe` Spring 520, the upper and of the spring being inserted .throughthejopening 27 to be clamped-land,` secured when the cup is; flattened;i When they holder is appliedto ,they supportinv frame 11 the lower endof i .the -sprlngis s ipped through the slot, 21v into position betweenthe frame sides.

y In Fig. 9 my improved brush holder is shown appliedto an eraserof theflat oblong type, inwhich' a strip '32. of `erasing, rubber isAadjustable within the rectangularv frame 33. `,Theframe is provided withopposite openings 34 and 35 at one end forreceiving 'the turnedinends14; and 15 ofthe holder 12, which may or may not have a brush securedthereto.

precision. Whenevery theA eraser is released from the hand' the yspringhinge connection between the frame andholder willlcause. the holder toextend outwardlyy inthe plane of Cpiesof this vpatent maybe obtained for'come within the scope of the invention.

the eraser disk so that the eraser structure is ialways in properposition to vbe taken in I do not desire to be limited to the exactconstructions" and arrangements herein described and referred to, aschanges and modifications can no doubt be made and still I yclaim asfollows: Y. 1.The-co1nbination with an eraser, of a supporting frameytherefor, and a handle spring hinged thereto. d v

2. A supporting :structure for erasersvr comvprisinga"U-shapedframe forreceiving the eraser.v betweenitsends, and `a holder hinged to saidframe at'the bend thereof. l

3. A supportingstructure for erasers comprising a lU-shapef frame forl,clamping an eraser between.fits;ends,ra holder hinged to said frametoform-an extension thereof, and a brush securedto-said holder.

4.Y A supporting structure for erasers comi prising a U-shapedframeforclarnping an A, eraser between itsends, a wire holder hinged to theend of said frame toform an extension thereof,.and yielding meansnormally y...

holding saidv holder ,extended and in the plane of said frame. l y d d'5.` A'L supporting structure for erasers comprisingy a U-shape clampingframe, a holder hinged tosaid frame at its bend to form continuationthereof, and` a ,spring-1 extend- `.ings between said holder and frametending toy hold saidholder. extendedin the plane of said frame.

. 6. A supporting structure for erasers com- -V prising a U-shapeframefor clamping` an eraser between its ends, a U-shape holderhavingits ends insertedinto jthe opposite ends of the bend of saidlU-frame, whereby said holder is hingedtosaid frame to form acontinuation thereof, the corners at the bend of said frame being cutaway diagonally to presentV cam surfaces to the end of said holderwherebysaid holder will normally be heldA extended from and in the planeof said frame. Y

In witness whereof, I `hereunto subscribe my name this 3rd day ofFebruary, A. D., 1919; i

Jol-IN AULD.

ive cents each, by addressing the Commissioner of Patents, Washington,20.6.

